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A151589 Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly 8 adjacent element pairs in decreasing order. 1
0, 5, 105372, 92123514, 25367820672, 3777055329267 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

Table of n, a(n) for n=4..9.

CROSSREFS

Sequence in context: A123591 A133381 A236066 * A243114 A038027 A237641

Adjacent sequences:  A151586 A151587 A151588 * A151590 A151591 A151592

KEYWORD

nonn

AUTHOR

R. H. Hardin May 21 2009

STATUS

approved

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Last modified September 20 20:02 EDT 2020. Contains 337265 sequences. (Running on oeis4.)